<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        textarea {
            margin-left: 50px;
            margin-top: 40px;
           border: 1px solid pink;
        }
        li {
            display: block;
            background-color: pink;
            width: 300px;
            height: 20px;
            margin-top: 10px;
        }
        li a {
            float:right;
        }
            </style>
</head>
<body>
    <textarea name="" id="" cols="30" rows="10"></textarea>
    <button>发布</button>
    <ul>
    </ul>
    <script>
        var btn = document.querySelector('button');
        var text = document.querySelector('textarea');
        var ul = document.querySelector('ul')
        btn.onclick = function() {
            if(text.value == ''){
                alert('你没有输入内容');
                return false;
            }else {
                var li = document.createElement('li');
                li.innerHTML = text.value + "<a href='javascript:;'>删除<a/>";
                ul.insertBefore(li,ul.children[0]);
                var as = document.querySelectorAll('a');
                for(var i = 0;i <as.length;i++) {
                    as[i].onclick = function() {
                        ul.removeChild(this.parentNode);
                    }
                }
            }
            
        }
    </script>
</body>
</html>